Technical site analysis

JS Differencer - Visualise the effect of disabling JavaScript on the web.

Core SERP Vitals Chrome Extension - Show the Core Web Vitals from the Chrome User Experience Report in the Google Sea

This extension measures the Core Web Vitals, providing instant feedback on loading, interactivity and layout shift me

Netpeak Spider — a desktop tool for day-to-day SEO audit, fast issue check, comprehensive analysis, and website scrap

SE Ranking provide every SEO analysis and marketing tool you need on board

SiteAnalyzer is a Web Crawler tool meant to scan URLs and perform a fast SEO analysis of a website.

Xenu's Link Sleuth (TM) checks Web sites for broken links.

WebSite Auditor this is the most Comprehensive Website SEO Audit Tool. On-page analysis & optimization.

Siteliner is a free service that lets you explore your website, revealing key issues that affect your site's quality